Really impressive pieces of engineering - just to share the results with you if you haven't seem them yet - DXO ranks the wide open performance most and specifies it in the so calls P-Mpix (=perceived magapixel) - which is an IMHO weird measure but should give you an idea of the wide open performance in comparison with different brands and cameras.

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__________________________________isn’t it funny, a ship that leaks from the topISO 9000 definition of quality: 'Degree to which a set of inherent characteristic fulfills requirements'I am the classic “Windows by Day, Mac by Night user'“The horizon of many people is a circle with zero radius which they call their point of view.” Albert Einstein